Summary

Prints in-place, all plastic, no external parts except for a small screw (2.5mm diameter).

For those few mini delta enthusiasts left, I pulled mine out of the garage, dusted it off. slapped marlin 1.1 on it, added these clips and the thing now prints beautifully, reliably and is dimensionally correct (!!). All thanks to the marlin G33 delta auto calibration (calculates delta height, endstops, delta radius and tower angles).